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Background: Short and valid instruments for measuring factors facilitating or hindering implementation efforts are
called for. This article describes (1) the adaptation of a shorter version of the Evidence-based Practice Attitude Scale
(EBPAS-50 items), and (2) the psychometric properties of the shortened version in both US and Norwegian data.

Methods: The US participants were mental health service providers (N = 418) recruited from clinics providing
mental health services in San Diego County, California. The Norwegian participants were psychologists, psychiatric
nurses, and psychology students (N = 838) recruited from the Norwegian Psychological Association and the
Norwegian Nurses Organization. A confirmatory factor analysis (CFA) approach was used.

Results: The reduction resulted in 36 items named EBPAS-36, and the original 12 factor model was maintained. The
EBPAS-36 had acceptable model fit, as indicated by a low degree of misspecification errors in both the US (RMSEA = .045
(CI90% .040–.049); SRMR = .05) and the Norwegian data (RMSEA = .052 (CI90% .047–.056, SRMR = .07). Incremental model fit
was fair in the US (CFI = .93, TLI = .91) and in the Norwegian samples (CFI = .91, TLI = .89). The internal consistency
(Cronbach’s α) in the US and the Norwegian samples were good for the total EBPAS-36 score (.79 and .86, respectively)
and were ranged from adequate to excellent for the subscales (US .60–.91 and Norway .61–.92).

Conclusions: The EBPAS-36 has adequate psychometric properties both in US and Norwegian samples, hence
indicating cross-cultural validity. It is a brief, pragmatic, and more user-friendly instrument than the EBPAS-50, yet
maintains a broad scope by retaining the original 12 measurement domains.